CN107941730B - Method and device for measuring concentration of ozone in atmosphere - Google Patents
Method and device for measuring concentration of ozone in atmosphere Download PDFInfo
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- CN107941730B CN107941730B CN201711139242.9A CN201711139242A CN107941730B CN 107941730 B CN107941730 B CN 107941730B CN 201711139242 A CN201711139242 A CN 201711139242A CN 107941730 B CN107941730 B CN 107941730B
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- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000010531 catalytic reduction reaction Methods 0.000 claims abstract description 20
- 230000001678 irradiating effect Effects 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims description 38
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 8
- 239000003054 catalyst Substances 0.000 claims description 6
- GOPYZMJAIPBUGX-UHFFFAOYSA-N [O-2].[O-2].[Mn+4] Chemical compound [O-2].[O-2].[Mn+4] GOPYZMJAIPBUGX-UHFFFAOYSA-N 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 135
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
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Abstract
The invention provides a method for measuring the concentration of ozone in the atmosphere, and a bagThe method comprises the following steps: detecting the flow of the gas to be detected, and if the flow of the gas to be detected is not less than a set threshold value, dividing the gas to be detected into two paths, namely a first path of gas and a second path of gas; o in the first path of gas3Catalytic reduction to O2The first path of gas after catalytic reduction is called as a third path of gas; respectively irradiating the second path of gas and the third path of gas by ultraviolet light; respectively acquiring fluctuating ultraviolet signal data when ultraviolet light irradiates a second path of gas and a third path of gas in a period; respectively acquiring mean value ultraviolet signal data of ultraviolet signals of a second path of gas and a third path of gas irradiated by ultraviolet rays within a period after preset time; calculated to obtain the concentration of ozone in the gas. According to the invention, by measuring the ultraviolet signal data before and after the gas is irradiated for a period of time, errors caused by ultraviolet light intensity changes are eliminated, and more accurate ozone concentration data can be obtained.
Description
Technical Field
The invention relates to the field of gas concentration calculation, in particular to a method and a device for measuring ozone concentration in atmosphere.
Background
Generally, it is difficult for light to transmit through an obstacle having a wavelength longer than that of the light. Because the wavelength of the ultraviolet ray is very small, the ozone molecules are very large, and the wavelength of the ultraviolet ray is just smaller than the ozone molecules and larger than the gases such as oxygen, nitrogen and the like, the ultraviolet ray can not pass through the ozone and is absorbed.
The existing method for measuring the concentration of ozone is an ultraviolet absorption method, and mainly comprises the steps of using an ultraviolet lamp to generate ultraviolet rays to irradiate gas and then measuring an ultraviolet signal. In the reaction tank, an ultraviolet detector measures an ultraviolet signal of a gas which does not undergo an ozone oxidation reaction and absorbs ultraviolet rays, and then the ultraviolet detector measures an ultraviolet signal of a gas which undergoes an ozone oxidation reaction and absorbs ultraviolet rays. The ozone concentration can be obtained by comparing the ultraviolet signals measured twice and calculating through a mathematical model.
The method comprises the following steps: the measurement method has very small difference of ultraviolet signals between the gas subjected to oxidation reaction and the gas not subjected to oxidation reaction, and when the intensity of the ultraviolet lamp light source is changed, the ultraviolet detector can couple the signal with the changed intensity of the ultraviolet lamp into the signal of the measurement system, so that the stability of measured data is poor, and the data is inaccurate.
Disclosure of Invention
The invention provides a method and a device for measuring the concentration of ozone in the atmosphere, aiming at overcoming the defects of the prior art.
According to a first aspect of the present invention, there is provided a method of determining the concentration of ozone in the atmosphere, comprising the steps of:
s101, detecting the flow of gas to be detected, and if the flow of the gas to be detected is not less than a set threshold value, dividing the gas to be detected into two paths, namely a first path of gas and a second path of gas;
s102, mixing O in the first path of gas3Catalytic reduction to O2The first path of gas after catalytic reduction is called as a third path of gas;
s103, irradiating the second path of gas by using ultraviolet light in a preset period;
acquiring fluctuation ultraviolet signal data m of ultraviolet rays when the second path of gas is irradiated by the ultraviolet rays in a period2；
After the ultraviolet rays irradiate the second path of gas for a preset time, acquiring mean ultraviolet signal data M of the second path of gas in a period2；
S104, irradiating the third path of gas with ultraviolet light in a preset period;
acquiring fluctuation ultraviolet signal data m of ultraviolet rays when the third path of gas is irradiated by the ultraviolet rays in a period1；
After the third path of gas is irradiated by ultraviolet rays for a preset time, acquiring mean ultraviolet signal data M of the third path of gas in a period1；
S105, calculating to obtain the concentration Delta S of ozone in the gas:
S＝ln(m1/m2)·K，
S1＝ln(M1/M2)·K，
△S＝S1-S,
where K is a fixed coefficient.
Further, the O in the first path of gas3Catalytic reduction to O2Means that O in the first path gas is reacted by using manganese dioxide catalyst3Catalytic reduction to O2。
Further, the method also comprises the following steps: the temperature of the gas in steps S101 to S104 is measured and compared with a preset temperature standard value to determine whether the data is accurate.
Further, the method also comprises the following steps: the gas pressure of the gas in the steps S101 to S104 is measured and compared with a preset standard value of the gas pressure to judge whether the data is accurate.
Preferably, the wavelength of the ultraviolet light is 253.7 nm.
According to a second aspect of the present invention, there is provided an apparatus for measuring the concentration of ozone in the atmosphere, comprising at least a reaction chamber, an air inlet, an air outlet, a flow meter, O3Scrubber, air pump, UV lamp, first ultraviolet detector, second ultraviolet detector and calculation module:
the gas inlet is communicated with the reaction chamber through a gas inlet pipeline, the gas inlet pipeline comprises a front section, a middle section and a rear section, and the gas outlet is communicated with the reaction chamber through a gas outlet pipeline;
the middle section of the gas inlet pipeline consists of a first pipeline and a second pipeline which can divide gas into two paths of gas, and the first pipeline and the second pipeline are connected with the rear section of the gas inlet pipeline through valves;
the flowmeter is arranged at the front section of the air inlet pipeline;
said O is3A scrubber disposed on the first pipe;
the air pump is arranged on the air outlet pipeline;
the UV lamp is arranged in the reaction chamber close to the joint of the gas inlet pipeline and the reaction chamber;
the first ultraviolet detector is arranged in the reaction chamber close to the UV lamp and used for detecting ultraviolet signal data of ultraviolet rays when the UV lamp emits the ultraviolet rays to irradiate the gas in a period;
the second ultraviolet detector is arranged in the reaction chamber close to the gas outlet pipeline and used for detecting mean ultraviolet signal data of gas after the UV lamp emits ultraviolet rays to irradiate the gas for a preset time in a detection period;
the calculation module is connected with the first ultraviolet detector and the second ultraviolet detector to receive data and calculate the concentration of ozone in the gas.
Further, said O3The scrubber is provided with a gas outlet for discharging O in the gas3Catalytic formation of O2Manganese dioxide catalyst of (1).
Further, the reaction chamber also comprises a temperature sensor, and the temperature sensor is arranged in the reaction chamber.
Further, the air pressure sensor is arranged on the air outlet pipeline.
Preferably, the UV lamp emits ultraviolet light having a wavelength of 253.7 nm.
Compared with the prior art, the invention has the beneficial effects that:
1. by dividing the raw gas into two gases, one of which is O3Catalytic reduction to O2Then, two ultraviolet signal data when the ultraviolet rays respectively irradiate two gases (one path of original gas and one path of gas after catalytic reduction) and two ultraviolet signal data of the gas after the ultraviolet rays respectively irradiate the two gases for a period of time are respectively obtained, and then the process of obtaining the ozone concentration is obtained by calculating the four ultraviolet signal data through a correlation formula, so that errors caused by the change of the ultraviolet light intensity are eliminated, and more accurate data can be obtained;
2. ultraviolet signal data which accord with a temperature standard value and an air pressure standard value are screened out by measuring the temperature and the air pressure of the reaction chamber, so that the reaction chamber is ensured to be a stable environment, and the accuracy of the data is ensured.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a method for determining the concentration of ozone in the atmosphere according to a first embodiment of the present invention;
FIG. 2 is a view showing the construction of an apparatus for measuring the concentration of ozone in the atmosphere according to a second embodiment of the present invention;
FIG. 3 is a circuit diagram of some components of an apparatus for measuring the concentration of ozone in the atmosphere according to a second embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
In some of the flows described in the present specification and claims and in the above figures, a number of operations are included that occur in a particular order, but it should be clearly understood that these operations may be performed out of order or in parallel as they occur herein, with the order of the operations being indicated as 101, 102, etc. merely to distinguish between the various operations, and the order of the operations by themselves does not represent any order of performance. Additionally, the flows may include more or fewer operations, and the operations may be performed sequentially or in parallel. It should be noted that, the descriptions of "first", "second", etc. in this document are used for distinguishing different messages, devices, modules, etc., and do not represent a sequential order, nor limit the types of "first" and "second" to be different.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and are not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Atmospheric ozone concentration is defined as: mass of ozone per unit volume (1 cubic meter).
Example one
As shown in fig. 1, a method for determining the concentration of ozone in the atmosphere according to an embodiment of the present invention is provided, which includes the steps of:
s101, detecting the flow of gas to be detected, and if the flow of the gas to be detected is not less than a set threshold value, dividing the gas to be detected into two paths, namely a first path of gas and a second path of gas;
s102, mixing O in the first path of gas3Catalytic reduction to O2The first path of gas after catalytic reduction is called as a third path of gas;
specifically, manganese dioxide catalyst is used for converting O in the first path of gas3Catalytic reduction to O2；
S103, irradiating the second path of gas with ultraviolet light in a preset period; the ultraviolet light is ultraviolet light with a wavelength of 253.7 nm.
Acquiring the fluctuation ultraviolet signal data m of ultraviolet rays when the ultraviolet rays irradiate the second path of gas in the period2；
The standard wave equation is:
since the light propagates in the air stream, the scalar u contains a mach factor, in which case the wave equation for the light is as follows:
u(x,0)＝f(x)
from this it is deduced:
where u is the quantity to be measured, c is usually a fixed constant, i.e. the propagation velocity, and a is the acceleration.
After the ultraviolet rays irradiate the second path of gas for a preset time, acquiring mean value ultraviolet signal data M of the second path of gas in a period2；
For example, if the preset period is half an hour, the preset time is 10 seconds, and the sampling time is once per minute, 30 ultraviolet signal data are obtained, and the average value of the 30 ultraviolet signal data is obtained.
S104, using ultraviolet light to process the third path of gas in a preset period; the ultraviolet light is ultraviolet light with a wavelength of 253.7 nm.
Acquiring fluctuation ultraviolet signal data m of ultraviolet rays when the ultraviolet rays irradiate a third path of gas in a period1；
After the ultraviolet rays irradiate the third path of gas for a preset time, acquiring mean ultraviolet signal data M of the third path of gas in a period1；
It should be noted that steps S103 and S104 can be performed independently or simultaneously, and the determination of the steps is also only for the sake of illustration, so that step S104 can also precede step S103.
S105, calculating to obtain the concentration Delta S of ozone in the gas:
S＝ln(m1/m2)·K，
S1＝ln(M1/M2)·K，
△S＝S1-S,,
where K is a fixed coefficient.
It should be noted that, in general, the gas can be regarded as an ideal gas, and the fixed coefficient K is the ratio of the specific heat capacity at constant pressure to the specific heat capacity at constant volume, that is: k is Cp/Cv.
In practical cases, the adiabatic index for a gas is related to the type of gas, the pressure and the temperature.
In steps S101 to S104, in order to ensure the accuracy of the data, the following operations are also required:
and measuring the temperature of each path of gas, and comparing the temperature with a preset temperature standard value to judge whether the data is accurate or not, wherein inaccurate data is discarded.
And measuring the air pressure of each path of gas, and comparing the measured air pressure with a preset air pressure standard value to judge whether the data is accurate or not, wherein inaccurate data is abandoned.
The times of acquiring various ultraviolet signal data can be acquired for multiple times to eliminate inaccurate values, the elimination can be single elimination, the data in one period can be directly eliminated, and other elimination conditions can be set according to specific application scenes.
Example two
As shown in FIG. 2, there is provided an apparatus for measuring the concentration of ozone in the atmosphere according to a second embodiment of the present invention, which comprises at least a reaction chamber 201, an inlet port 202, an outlet port 203, a flow meter 204, and O3Scrubber 205, air pump 206, UV lamp 207, first ultraviolet detector 208, second ultraviolet detector 209, and calculation module 210:
the gas inlet 202 is communicated with the reaction chamber 201 through a gas inlet pipeline 214, the gas inlet pipeline 214 comprises a front section 2141, a middle section 2142 and a rear section 2143, and the gas outlet 203 is communicated with the reaction chamber 201 through a gas outlet pipeline 215;
the middle section 2142 of the gas inlet pipe 214 is composed of a first pipe 21421 and a second pipe 21422 which can divide the gas into two paths of gas, and the first pipe 21421 and the second pipe 21422 are connected with the rear section 2143 of the gas inlet pipe 2143 through a valve 213;
the valve 213 may be a three-way valve 213 that blocks the second pipe 21422 from communicating with the rear section of the intake pipe 214 when the first pipe 21421 communicates with the rear section 2143 of the intake pipe 214; alternatively, when the second duct 21422 and the rear section 2143 of the intake duct 214 are communicated, the first duct 21421 is blocked from communicating with the rear section 2143 of the intake duct 214; of course, alternatively, the three-way valve 213 may also open or block the first pipe 21421 and the second pipe 21422 to communicate with the rear section 2143 of the intake pipe 214 at the same time according to the requirement.
A flow meter 204 provided at the front section 2141 of the intake duct 214 for measuring the flow rate of the gas at the intake port 202 to control whether the gas flows in;
O3a scrubber 205 disposed on the first pipe 21421 for removing O in the gas in the first pipe 214213Carrying out catalytic reduction to generate O2；
Specifically, O3The scrubber 205 is provided with a gas filter for removing O from the gas3Catalytic formation of O2Manganese dioxide catalyst of (1).
An air pump 206 disposed on the air outlet pipe 215 for pumping out the gas of the reaction chamber 201;
specifically, the air pump 206 generates a gas flow rate of 1L/min to the reaction chamber 201.
A UV lamp 207 disposed near the reaction chamber 201 where the gas inlet pipe 214 is connected to the reaction chamber 201 for emitting energy O3Absorbed ultraviolet light;
preferably, the UV lamp 207 emits ultraviolet light having a wavelength of 253.7 nm; generally, it is difficult for light to transmit through an obstacle having a wavelength longer than that of the light. Because the wavelength of the ultraviolet ray is very small, the ozone molecules are very large, and the wavelength of the ultraviolet ray is just smaller than the ozone molecules and larger than the gases such as oxygen, nitrogen and the like, the ultraviolet ray can not pass through the ozone and is absorbed. Because ultraviolet light with a wavelength of 253.7nm is absorbed by ozone and is most difficult to penetrate through the ozone, ultraviolet light with a wavelength of 253.7nm is selected in a laboratory.
A first ultraviolet detector 208 disposed in the reaction chamber near the UV lamp 207 to detect fluctuation ultraviolet signal data of ultraviolet rays when the UV lamp 207 emits ultraviolet rays to irradiate the gas during a period;
acquiring the fluctuation ultraviolet signal data m of ultraviolet rays when the ultraviolet rays irradiate the second path of gas in the period2；
Acquiring fluctuation ultraviolet signal data m of ultraviolet rays when the ultraviolet rays irradiate a third path of gas in a period1；
A second ultraviolet detector 209 disposed in the reaction chamber 201 near the gas outlet pipe 215 to detect ultraviolet signal data of the gas after the UV lamp 207 emits ultraviolet rays to irradiate the gas for a predetermined time during a cycle;
specifically, mean value ultraviolet signal data M of the second path of gas after ultraviolet rays irradiate the second path of gas for preset time in a period is obtained2；
Acquiring mean value ultraviolet signal data M of the third path of gas after ultraviolet rays irradiate the third path of gas for preset time in a period1；
A calculation module 210 connected to the first ultraviolet detector 208 and the second ultraviolet detector 209 to receive the data and calculate the concentration Δ S of ozone in the gas:
S＝ln(m1/m2)·K，
S1＝ln(M1/M2)·K，
△S＝S1-S,
where K is a fixed coefficient.
The device also comprises a temperature sensor 211, wherein the temperature sensor 211 is arranged in the reaction chamber 201 and used for measuring the temperature of the reaction chamber 201 and comparing the temperature with a preset temperature standard value to judge whether the data is accurate or not.
The device further comprises an air pressure sensor 210, wherein the air pressure sensor 210 is arranged on the air outlet pipeline 215 and used for measuring the air pressure of the reaction chamber 201 and comparing the measured air pressure with a preset air pressure standard value to judge whether the data is accurate or not.
As shown in fig. 3, a circuit diagram of some components in an apparatus for measuring the concentration of ozone in the atmosphere according to a second embodiment is provided, and the left diagram is a circuit for generating an amplified signal for 253.7nm ultraviolet light by a P2 photoelectric tube (UV lamp) under a pressure drop of 15V; and the right diagram is a circuit for detecting amplified ultraviolet signal data by an ultraviolet detector and outputting related data.
The working mode of the device for measuring the concentration of ozone in the atmosphere is as follows:
during detection, gas to be detected enters from the gas inlet 202, when the gas enters the front section 2141 of the gas inlet pipeline 214, the flow meter 204 starts to detect the flow rate of the gas to be detected, and if the flow rate of the gas to be detected is not smaller than a set threshold value, the gas to be detected passes through the front section 2141 of the first pipeline 214; when waiting forThe gas to be measured enters the middle section 2142 of the gas inlet pipeline 214 through the front section 2141 of the first pipeline 214, and then the gas to be measured is divided into two paths of gas which respectively flow into the first pipeline 21421 and the second pipeline 21422 of the middle section 2142 of the gas inlet pipeline 214; because the first pipe 21421 is internally provided with O3The scrubber 205, and therefore the gas entering the first conduit 21421, undergoes a catalytic reduction reaction, primarily O3Manganese dioxide in scrubber 205 removes O from the gas3Catalytic reduction to O2(ii) a When the gas in the first pipe 21421 undergoes the catalytic reduction reaction, the valve 213 may be opened first to allow only the gas in the second pipe 21422 to enter the reaction chamber 201 (or to wait for the gas in the first pipe 21421 to undergo the catalytic reduction reaction, and then obtain the data to be measured); when the gas enters the reaction chamber 201, the UV lamp 207 is turned on to irradiate the gas with ultraviolet rays, the gas starts to absorb the ultraviolet rays, and simultaneously, the data m of the fluctuating ultraviolet signal of the ultraviolet rays emitted by the UV lamp 207 in the period starts to be acquired1After a period of time, obtaining the mean value ultraviolet signal data M of the gas absorbing ultraviolet rays in the same period1Certainly, when data is acquired, the temperature sensor 211 and the air pressure sensor 210 respectively monitor the temperature and the air pressure of the reaction chamber 201, and respectively compare the temperature and the air pressure with preset standard values of air pressure and temperature to judge whether the data is accurate or not and is not accurate to be rejected; the air pump 206 is turned on to pump out the gas in the reaction chamber 201, the valve 213 is opened to communicate the first pipe 21421 with the rear section of the gas inlet pipe 214 after the gas is pumped out, when the gas enters the reaction chamber 201, the UV lamp 207 is turned on to irradiate the gas with ultraviolet rays, the gas starts to absorb the ultraviolet rays, and meanwhile, the fluctuation ultraviolet signal data m of the ultraviolet rays emitted by the UV lamp 207 in the period starts to be acquired12After a period of time, obtaining the mean value ultraviolet signal data M of the gas absorbing ultraviolet rays in the same period2Certainly, when data is acquired, the temperature sensor 211 and the air pressure sensor 210 respectively monitor the temperature and the air pressure of the reaction chamber 201, and respectively compare the temperature and the air pressure with preset standard values of air pressure and temperature to judge whether the data is accurate or not and is not accurate to be rejected; when the data acquisition is finished, the calculation module 210 connecting the first ultraviolet detector 208 and the second ultraviolet detector 209 is based on the followingThe concentration Delta S of the ozone is calculated by a formula,
S＝ln(m1/m2)·K，
S1＝ln(M1/M2)·K，
△S＝S1-S,
where K is a fixed coefficient.
It will be clear to those skilled in the art that, for the sake of convenience and brevity of description, the specific operation of the system, modules and associated units described above may be referred to in the foregoing description
The corresponding process in the method embodiment is not described herein again.
In the 2 embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described method embodiments are merely illustrative, and for example, the division of the devices or modules is only one logical division, and other divisions may be realized in practice, for example, a plurality of modules or components may be combined or integrated into another system, or some features may be omitted, or not executed. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method of determining the concentration of ozone in the atmosphere, comprising the steps of:
s101, detecting the flow of gas to be detected, and if the flow of the gas to be detected is not less than a set threshold value, dividing the gas to be detected into two paths, namely a first path of gas and a second path of gas;
s102, mixing O in the first path of gas3Catalytic reduction to O2The first path of gas after catalytic reduction is called as a third path of gas;
s103, irradiating the second path of gas by using ultraviolet light in a preset period;
acquiring fluctuation ultraviolet signal data m of ultraviolet rays when the second path of gas is irradiated by the ultraviolet rays in a period2；
After the ultraviolet rays irradiate the second path of gas for a preset time, acquiring mean ultraviolet signal data M of the second path of gas in a period2；
S104, irradiating the third path of gas with ultraviolet light in a preset period;
acquiring fluctuation ultraviolet signal data m of ultraviolet rays when the third path of gas is irradiated by the ultraviolet rays in a period1；
After the third path of gas is irradiated by ultraviolet rays for a preset time, acquiring mean ultraviolet signal data M of the third path of gas in a period1；
S105, calculating to obtain the concentration Delta S of ozone in the gas:
S＝ln(m1/m2)·K，
S1＝ln(M1/M2)·K，
△S＝S1-S,
where K is a fixed coefficient.
2. The method according to claim 1, wherein O in the first path gas is introduced into the first path gas3Catalytic reduction to O2Means that O in the first path gas is reacted by using manganese dioxide catalyst3Catalytic reduction to O2。
3. The method of claim 1, further comprising: the temperature of the gas in steps S101 to S104 is measured and compared with a preset temperature standard value to determine whether the data is accurate.
4. The method of claim 1, further comprising: the gas pressure of the gas in the steps S101 to S104 is measured and compared with a preset standard value of the gas pressure to judge whether the data is accurate.
5. The method of claim 1, wherein the ultraviolet light has a wavelength of 253.7 nm.
6. The device for measuring the concentration of ozone in the atmosphere is characterized by at least comprising a reaction chamber, an air inlet, an air outlet, a flowmeter and O3Scrubber, air pump, UV lamp, first ultraviolet detector, second ultraviolet detector and calculation module:
the gas inlet is communicated with the reaction chamber through a gas inlet pipeline, the gas inlet pipeline comprises a front section, a middle section and a rear section, and the gas outlet is communicated with the reaction chamber through a gas outlet pipeline;
the middle section of the gas inlet pipeline consists of a first pipeline and a second pipeline which can divide gas into two paths of gas, and the first pipeline and the second pipeline are connected with the rear section of the gas inlet pipeline through valves;
the flowmeter is arranged at the front section of the air inlet pipeline;
said O is3The scrubber is arranged on the first pipeline;
the air pump is arranged on the air outlet pipeline;
the UV lamp is arranged in the reaction chamber close to the joint of the air inlet pipeline and the reaction chamber;
the first ultraviolet detector is arranged in a reaction chamber close to the UV lamp to detect fluctuation ultraviolet signal data of ultraviolet rays when the UV lamp emits the ultraviolet rays to irradiate gas in a period;
the second ultraviolet detector is arranged in the reaction chamber close to the gas outlet pipeline so as to detect mean ultraviolet signal data of gas after the UV lamp emits ultraviolet rays to irradiate the gas for a preset time in a period;
the calculation module is connected with the first ultraviolet detector and the second ultraviolet detector to receive data and calculate the concentration of ozone in the gas.
7. The apparatus of claim 6, wherein said O is3The scrubber is provided with a gas outlet for discharging O in the gas3Catalytic formation of O2Manganese dioxide catalyst of (1).
8. The apparatus of claim 6, further comprising a temperature sensor disposed within the reaction chamber.
9. The apparatus of claim 6, further comprising an air pressure sensor disposed on the outlet conduit.
10. The apparatus of claim 6, wherein the UV lamp emits ultraviolet light having a wavelength of 253.7 nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711139242.9A CN107941730B (en) | 2017-11-16 | 2017-11-16 | Method and device for measuring concentration of ozone in atmosphere |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711139242.9A CN107941730B (en) | 2017-11-16 | 2017-11-16 | Method and device for measuring concentration of ozone in atmosphere |
Publications (2)
| Publication Number | Publication Date |
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| CN110455734A (en) * | 2019-08-14 | 2019-11-15 | 合肥福瞳光电科技有限公司 | The monitoring method and its monitoring device of ozone concentration |
| CN114354527A (en) * | 2022-01-14 | 2022-04-15 | 张全星 | Detection module of ozone concentration analyzer |
| CN117236528B (en) * | 2023-11-15 | 2024-01-23 | 成都信息工程大学 | Ozone concentration forecasting method and system based on combined model and factor screening |
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